NIL
IPos hash_head = NIL; /* head of hash chain */
if (hash_head != NIL && s->prev_length < s->max_lazy_match &&
s->head[s->hash_size-1] = NIL; \
s->strstart - (IPos)MAX_DIST(s) : NIL;
*p = (Pos)(m >= wsize ? m-wsize : NIL);
*p = (Pos)(m >= wsize ? m-wsize : NIL);
IPos hash_head = NIL; /* head of the hash chain */
if (hash_head != NIL && s->strstart - hash_head <= MAX_DIST(s)) {